Cycles is not using the materials created by MakeHuman
I'm guessing that the Make Human importer sets up a Blender Internal Material based on the Material that's in the file you imported.  This is not automatic yet for Cycles rendering yet.

First you have to go to the Materials Tab and click the 'Use Nodes' button.

Now you can up the Node Editor and add an Image Texture.  Next, plug the Texture's Color output into the the Shader node's Color input.